More than 104,000 working Irish people are at risk of poverty, according to a new report from Social Justice Ireland.
The think-tank says the figure indicates that the employment system is broken and workers' rights are not being protected or prioritised by policy makers.
It adds that the number has been rising since 2009, despite the economic recovery.
The Social Justice Ireland report, Poverty Focus 2018, concludes that, overall, one in six people in Ireland today survives on an income below the poverty line, making up 16.5% of the population.
The research found 780,000 people live in poverty in this country and over a quarter (26.5%) are children.
The think-tank says the failure to make tax-credits refundable is unacceptable.
Social Justice Ireland CEO Dr Seán Healy said: "If people in employment can't be guaranteed a life free from poverty, then there is something seriously wrong. We have been saying for quite some time now that Ireland's social contract is broken."
"This is further proof. The priorities of our policy makers should reflect the will of the people. This is not the will of the Irish people. Policy makers need to take action."